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Vienna rectifier is one of the most popular topologies for three-phase PFC converter. Many control schemes were presented for Vienna rectifiers with unity power factor. Because of the small phase shift θ caused by the inductor or current detection delay, a zero-crossing detection error occurs, resulting in zero-crossing current spikes. This paper presents two SVPWM methods for three phase Vienna rectifiers...
This paper introduces the unified equivalent circuit model for modular high voltage(HV) power generation architectures. The HV generation architectures are introduced considering the modularity of key HV components such as transformers or rectifier circuits firstly. An equivalent resister and capacitor circuit network is adopted to model the HV transformer and multi-stage voltage multiplier circuit...
The four-quadrant converters applied to the locomotive traction have higher requirements for the power density and reliability. Compared with conventional IGBTs, RC-IGBTs have the advantages of low thermal resistance and high current density. In this paper, RC-IGBT is applied to four-quadrant converter and the working characteristics and pulse distribution of four-quadrant converter under the desaturation...
In this paper a design and simulation model of a brushless, self-excited field winding machine is presented. The rotor of this machine possesses two windings, a field winding and a “transformer” winding, that are connected through a diode rectifier circuit. Using field-oriented control techniques, an AC magnetic field is generated by the stator windings that is always aligned with the transformer...
This paper presents a new four-quadrant bridgeless boost type rectifier with the use of Active Virtual Ground (AVG) technology. The presented topology can step up the AC grid voltage to a regulated DC voltage under a stable bidirectional current flow with real power or reactive power delivery. By using bridgeless rectifier configuration and 3-level switching method, only two high frequency switches...
VIENNA rectifier with simple structure, which is widely used in charging systems for electric vehicle, realizes the operation of unit power factor and low harmonic. However, grid voltage unbalance will aggravate the dc-link voltage ripple and input current THD. A novel control scheme is presented to solve the impacts of three unbalanced grid voltage for VIENNA rectifier in this paper. The enhanced...
This paper presents dc-dc converter based on voltage dividing class E amplifier. Class E2 dc-dc converter, which is one of the converter suitable for high operating frequency is studied. Class E2 dc-dc converter composed of a Class E amplifier and Class E rectifier. the amplifier side and rectifier side of class E2 dc-dc converter can achieve ZVS and ZDS. However, it is indicated that peak switch...
EMI noise could bring electromechanical damages to the motors as well as reduce the stability of AC traction system. Since the high frequency noises propagate paths are quite complicated compared with fundamental frequency components, the high frequency EMI noise coupled through system's parasitic parameters is difficult to analyze and eliminated. In this paper, a common-mode equivalent circuit as...
In this work, a previous software used to simulate partial discharges (PDs) under Alternating Current (AC) stress has been modified in order to evaluate the PDs behavior under a voltage stress close to the Direct Current (DC) waveform. By using a full-wave and a half-wave rectifier, the specimen with an air void defects has been subjected to a gradual constant stress. Finally, a capacitive filter...
The study presented in this paper shows how the conduction modes of a three-phase diode rectifier affect the distribution of noise in an ac-fed three-phase motor-drive system. It is found that in all of the conduction modes, the commonly used noise separation equations will not result in a clean separation of the common-mode (CM) and the differential-mode (DM) noise. This paper shows the intricacies...
Phase-shifting reactor (PSR) can be used to solve the harmonic problems caused by rectifiers. In this paper, according to the active power balance principle, the relationships among DC current of load, currents of power supply side, as well as capacity of core limb are built, and the design specifications of winding and core are obtained. simulation of 6-phase rectifier system with PSR by the equivalent...
In this research, a dynamic magnetic equivalent circuit (MEC)-based model of a 6-phase wound rotor synchronous generator has been developed. The model is coupled with dual active rectifier bridges to enable detailed switching waveform-level simulations of an MVDC generation system. The MEC model of the generator accurately captures time and spatial harmonics as well as saturation of magnetic material...
This paper examines the added cost, in terms of mass, required to provide confidence that a machine optimized for passive DC rectification can be accurately represented using a qd model. The inclusion of a set of constraints during the design process is shown to greatly improve the match between qd and detailed models along the entire range of operation for the system, however it is seen that there...
This paper presents a space vector pulse width modulation and proportional resonant control scheme for single-phase three-level rectifier for electric railway traction applications. The proposed SVPWM modulation has been tailored to the single-phase rectifier without an additional PLL. Moreover, vectors and vectors sequence have been carefully designed to achieve neutral point voltage balance. Based...
This work mainly focuses on designing and modeling of 18-pulse autotransformer rectifier unit. The dq rotating reference frame (Park's Transformation) is used to design the average model. Polynomial fits are required to build up from essential parameters like α, kv and ki that must be extracted from switching model or actual setup. The designed model is computationally efficient, time invariant and...
An investigation is carried out to assess the conducted emission (CE) in a wireless power transfer (WPT) system for automotive applications. The assessment is performed by simulations of the whole system which is modeled by a circuit representation of each single subsystem, including the coupled inductive coils, compensation networks, converters and terminations. The obtained circuit model is analyzed...
This paper focuses on the design of secondary control loop in wireless EV charging system according to model calculation instead of empirical estimation or simulation attempt. To simplify the structure of secondary circuit, semi-bridgeless active rectifier is used. The analysis and modeling of semi- bridgeless active rectifier is completed by small-signal modeling method. The secondary control loop...
In both the traditional diode uncontrollable rectifier circuit and thyristor phased rectifier circuit, the shortcomings of low power factor are difficult to overcome. PWM rectifier circuit is to use full control power switch devices and adopts PWM control mode of rectifier circuit, through the adoption of appropriate control strategies and PWM modulation technology, PWM rectifier circuit can realize...
Advancements in power electronics are making it feasible to build high power DC distribution systems. Their power level could reach significant peaks (tens of MW), as in shipboard DC power systems. Such a high power requires high voltage levels to be delivered, which in turn leads to high short-circuits currents. As a result, the design of system protections needs to be carefully performed. Moreover,...
Based on the Cockcroft-Walton (CW) voltage multiplier, a novel receiver topology for IPT (Inductive Power Transfer) system is proposed. The proposed receiver topology enhances the efficiency of the IPT system through achieving that the induced secondary voltage and current are in-phase with the appropriate control method. This paper carried on the modeling of the receiver topology, and deduced the...
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